Method of finishing armor-plate.



PATENTED DEC. 24, 1907.

E. W. LEWIS & .TLSl UNGBR.

METHOD OF FINISHlNG ARMOR PLATE.

' APPLICATION FILED MAY 19,1903.

v wn'n :asis

QI I Inh/f To allwhcm it may concern.

Y gheny county,

"to reduce the amount UNITED STATES- EDWIN W. LEWIS AND JOHN S.

To cAENE'e-IE STEEL coMPANY, Aor T IoN-oE NEW JEEsEY.'

PATENT oEEIoE.-

UNGEE,E oF MUNHALL, 'IENI'vSY'LvAN'IA AssIeNoR rIrrsBUEe, PENNSYLVANIA, A coEPoRA,

METIOD OF FINISHING ARMOR-PLATE.

i Specification of Letters Patent. Applicant neiiny I9.A 1903. Serin Nq: 157:66.'

Patented Dec. 24,19o7..

Be itknownthat We, 'EDWIN W. LEWIS andJoIIN S. UNGEE, both of Munhall, Alle- Pennsylvania, have` .invented a new and useful Method of Finishing A'rmor- Plate, of which the following is a full, clear,

and exact description,"reference being lhad to the accompanying drawings,forming part of this specification, in which a Figure 1 is a plan view o f one form of apparatus arranged, to carry out our invention,

and Fig.' 2 is a side elevation of the same.

Our invention relates to the finishing ofv face-hardened armor of time and labor necl essary in nishing such lates.

fout on the rough plate and leclprocatingtool, such as a planer. :The

late, whichis vnow slightly larger than its nal size, is then heated and water-quenched, thus making the carburized face portion of glassy hardness; and to finish the plate to the exact formdesired, it is turned over with the hardened face down-and is cut with'a reciprocating lor slow moving cutter through 'the softer back and down to the cemented and water-quenched portion.v 'This portion cannot beworked by anyordinary cutting grinding. action of anem'ery wheel. These two cutting operations, one before the water-.

quenching and `one after the water-'quench-j ing, have been necessary because no' ordinary cutting tool willactl upon the glass-hard` Water-quenched portion, and hence. this face portion Vis brought tonearly the final form before water-quenching, and then finished to `final 'form by lgrindin The action of vcutting tools upon the and the expense of finishing the plates `4has' been great.

Infinishing'armor plate ac'cording'tolour l The., advantages o to nearly itsfinal form;

plate,`and is designed f table carrying t tool, and in practice is cut away by the slow carburized face-is slowl ingof .the saw in-the and difficult, evenbefo're water-quenching,

belinda ben' outwardly, an

plate is carried out by cold sawing. We ave found that this non-homogeneous face invention., one of thesteps of the hardened plate maybe sawedby the use cfa i cold saw, the sticking and stopping of the saw in the kerf being prevented byb'ending away -the'partbeing cutoff, from the` saw, to prevent pinching it. v v

T- e'process may be used in different Ways for example the plat-e, after carburizing, and before liquid-quenching, vn'ifyy be cold-sawed and after reheating and liquid-quenching the plate may thenbe again finalforrn or the plate,

cQld-sawed in. a similar manner into the after carburizing and before liquid quenching,l may be roughr.'

sawed with a .cold saw to nearly'its final form, .and affter'reheating and liquid quenchY mgite'may .be finished by the old method of cutting through the 'back with aslow moving' tool andthen grindingaway .the strip of hardenedl face; or, asa third variation, the plate vmay be roughed out after carburizingandbel forewater-quenchingby ordinaryslow-moving tools;-

-4 In all vthree vcases the step of cold sawingA may be carried `the old step, a corresponding reduction .in time andv expense isobtained.l VIn the drawings, in' which.we show gne form of apparatusfor carrying out the cold sawing ste s, 2 'represents the saw, 3 theplate andwaterand 7` designates a aratusthe table is fed pro- -gressivel v tOWar thesaw in thedirection of `:the lengt of the cut, and the saw is revolved at a rate of peripheral speed of referably four or, five miles erminute, t ough the speedmay be varied as desired. The bindkerffis prevented stream `of water directed against the y cut vfrom the bya ' reventing pinching.'

replaces one of the oldcutting steps, and as it out in much less time thanV piece late, thus causingfit. to

*105 our invention" resultand after reheatin'g Aand liquide quenchingit may. be finished to final form by Wh1ch Water is ydischarged f from replacing one of the steps of cutting by -a slow moving tool, with the step of cutting by the cold saw, thus reducing` the time, labor and expense.

Variations in the method may be made.

other than those referred to, and many Variations may be made in the form and arrangeconsistingin carburizing its face and llquidhardening the same, subjectingthe plate to two cutting operations, one before and one after liquid quenching, and cold sawing the plate in carrying out the latter step; substantially as described.v p

' 2. The method of finishing armor plate, consisting in carburizing the face of the plate, rough cutting the plate, Water-hardening the carburized face, and then cold sawing the plate to final form; substantially as 'described.

In testimony whereof, we have hereunto set our hand. EDWIN W. LEWIS.

JOHN S. UNGER Witnesses:

L. M. REDMAN, H. M. CORWIN. 

